What does code P1434 mean?

Q: What does code P1434 mean?

Secondary Air Injection Pump Relay Circuit Short To B+. P1434 on Volkswagen vehicles means the engine control module (ECM) has detected a short to battery voltage on the control circuit for the secondary air injection (SAI) pump relay. The ECM commands the relay on during cold starts to pump fresh air into the exhaust, but the circuit shows voltage when it should be low, indicating a wiring or relay fault.

DTC codes / Volkswagen codes / P1434

P1434 · VolkswagenSecondary Air Injection Pump Relay Circuit Short To B+

P1434 on Volkswagen vehicles means the engine control module (ECM) has detected a short to battery voltage on the control circuit for the secondary air injection (SAI) pump relay. The ECM commands the relay on during cold starts to pump fresh air into the exhaust, but the circuit shows voltage when it should be low, indicating a wiring or relay fault.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.